I currently have an ATI 5870, and since the ATI 6970 is only marginally faster, my only viable upgrade path (barring any magical new ATI card announcements in the next 3-4 months..) is to get another ATI 5870 and crossfire them.
However, I also use three monitors -- not for gameplay, but for productivity reasons in Windows 7. All my gaming is, and will continue to be, on my single center monitor. I guess I could do eyefinity (spread one game across 3 monitors in ultra-mega-widescreen mode) but that's not really why I am doing Crossfire. I am doing crossfire because I need more framerate at my preferred resolution than a single ATI 5870 can consistently deliver.
Are there any caveats I should know about with an ATI 5870 crossfire configuration -- will I get boned if I want to use 3 monitors in Windows, but only 1 in games?
I went ahead and secured another ATI 5870 1GB for cheap-ish on eBay, so I'm going to give it a shot, but I'd like to hear any advice anyone has before I proceed.